companion

1. (n) A friend, acquaintance, or partner; someone with whom one spends time or accompanies 2. (n) (figuratively) A thing or phenomenon that is closely associated with another thing, phenomenon, or person. 3. (n) (dated) A person employed to accompany or travel with another. 4. (n) (attributive) An appended source of media or information, designed to be used in conjunction with and to enhance the main material. 5. (n) (astronomy) A celestial object that is associated with another. 6. (n) A knight of the lowest rank in certain orders. 7. (n) (nautical) The framework on the quarterdeck of a sailing ship through which daylight entered the cabins below. 8. (n) (nautical) The covering of a hatchway on an upper deck which leads to the companionway; the stairs themselves. 9. (n) (topology) A knot in whose neighborhood another, specified knot meets every meridian disk. 10. (v) (obsolete) To be a companion to; to attend on; to accompany. 11. (v) (obsolete) To qualify as a companion; to make equal. 12. (n) (obsolete, derogatory) A fellow; a rogue.